Estimate the total land coverage area of this county in year 2000 according to the forest area of 117 raster units of TM image of Heshun county in Shanxi province
- Calculate the mean of 117 sample pixels, then multiply 2,697,460, the result is the estimated total area;
- Estimate the population variance by sample data, estimate the sampling accuracy by population variance and sample size.
Calculate:
- Estimate the total forest area of Heshun county:
Sampling accuracy:
of the forest area in pixel ；
Confidence level
；
All the image pixel size
N
in the re search areas
;
Sample value
；
Sample mean 
.